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Stockholders' Equity (Narrative) (Details)
 3 Months Ended 9 Months Ended
Dec. 31, 2017
vote
$ / shares
shares
Dec. 31, 2016
$ / shares
shares
Dec. 31, 2017
USD ($)
vote
$ / shares
shares
Dec. 31, 2016
$ / shares
shares
Mar. 31, 2017
$ / shares
shares
Class of Stock [Line Items]          
Common stock, shares authorized (in shares) | shares 250,000,000   250,000,000   250,000,000
Common stock, par value (in USD per share) | $ / shares $ 0.01   $ 0.01   $ 0.01
Preferred stock, shares authorized (in shares) | shares 5,000,000   5,000,000   5,000,000
Preferred stock, par value (in USD per share) | $ / shares $ 0.01   $ 0.01   $ 0.01
Voting rights, number of votes per common share owned | vote 1   1    
Dividends declared on common stock | $     $ 0    
Restricted Shares          
Class of Stock [Line Items]          
Restricted stock repurchased during period (in shares) | shares 0 780 20,549 25,768  
Restricted stock acquired, average cost per share (in USD per share) | $ / shares   $ 45.83 $ 52.33 $ 55.51